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authorwhitequark <whitequark@whitequark.org>2020-04-21 15:33:12 +0000
committerwhitequark <whitequark@whitequark.org>2020-04-21 15:33:12 +0000
commit7f5313e6c3c932a82a0fac7719d7c7100342ec77 (patch)
treebf8c866e1068788b460aa5b360b407966dfdb97e
parent06985c3afdba579d0bba266bb6daba0101358ad5 (diff)
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cxxrtl: add -O6, a shortcut for running `proc; flatten`.
People judge a compiler backend by the first impression, and the metric they judge it for is speed. -O6 does severely impact debuggability, but it provides equally massive gains in performance, so use it by default.
-rw-r--r--backends/cxxrtl/cxxrtl.cc18
1 files changed, 14 insertions, 4 deletions
diff --git a/backends/cxxrtl/cxxrtl.cc b/backends/cxxrtl/cxxrtl.cc
index f5a8e18b5..eb769ac3f 100644
--- a/backends/cxxrtl/cxxrtl.cc
+++ b/backends/cxxrtl/cxxrtl.cc
@@ -424,6 +424,7 @@ struct CxxrtlWorker {
bool localize_internal = false;
bool localize_public = false;
bool run_opt_clean_purge = false;
+ bool run_proc_flatten = false;
bool max_opt_level = false;
std::ostringstream f;
@@ -1929,8 +1930,12 @@ struct CxxrtlWorker {
void prepare_design(RTLIL::Design *design)
{
bool has_sync_init, has_packed_mem;
+ log_push();
check_design(design, has_sync_init, has_packed_mem);
- if (has_sync_init) {
+ if (run_proc_flatten) {
+ Pass::call(design, "proc");
+ Pass::call(design, "flatten");
+ } else if (has_sync_init) {
// We're only interested in proc_init, but it depends on proc_prune and proc_clean, so call those
// in case they weren't already. (This allows `yosys foo.v -o foo.cc` to work.)
Pass::call(design, "proc_prune");
@@ -1945,13 +1950,13 @@ struct CxxrtlWorker {
log_assert(!(has_sync_init || has_packed_mem));
if (run_opt_clean_purge)
Pass::call(design, "opt_clean -purge");
- log("\n");
+ log_pop();
analyze_design(design);
}
};
struct CxxrtlBackend : public Backend {
- static const int DEFAULT_OPT_LEVEL = 5;
+ static const int DEFAULT_OPT_LEVEL = 6;
CxxrtlBackend() : Backend("cxxrtl", "convert design to C++ RTL simulation") { }
void help() YS_OVERRIDE
@@ -2138,6 +2143,9 @@ struct CxxrtlBackend : public Backend {
log(" -O5\n");
log(" like -O4, and run `opt_clean -purge` first.\n");
log("\n");
+ log(" -O6\n");
+ log(" like -O5, and run `proc; flatten` first.\n");
+ log("\n");
}
void execute(std::ostream *&f, std::string filename, std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
{
@@ -2170,8 +2178,10 @@ struct CxxrtlBackend : public Backend {
extra_args(f, filename, args, argidx);
switch (opt_level) {
- case 5:
+ case 6:
worker.max_opt_level = true;
+ worker.run_proc_flatten = true;
+ case 5:
worker.run_opt_clean_purge = true;
case 4:
worker.localize_public = true;